Electrified Downhill bike

[zeropointbug]

Here is the donor bike, a 2 year old mountain bike from GT Bikes. 24 speed, alum. frame, magnesium fork, fr and rr disv brakes, so it should be a decent electric converter.

That's where I thought the batt and controller could go? Although the battery could be moved up and controller could move down and further back?

Each cell is 6.8 x150 x210mm, I still don't know whether I want to go 14 or 16s pack.